dyld_shared_cache processing / Single-Image loading for BinaryNinja

Last update: Dec 28, 2022

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Overview

Dyld Shared Cache Parser

Author: cynder (kat)

Dyld Shared Cache Support for BinaryNinja

Without any of the fuss of requiring manually loading several unrelated images, or the awful off-image addresses, and with better output than IDA, Hopper, or any other disassembler on the market.

Installation + Usage

Open the plugin manager
Search for "Dyld" and install this plugin

Usage:

Open Dyld Shared Cache file with BN
Select the Image you would like to disassemble
Congrats, you are now Reverse Engineering the Mach-O

Description:

This project acts as an interface for two seperate projects; DyldExtractor, and ktool. Mainly DyldExtractor.

DyldExtractor is a project written primarily by 'arandomdev' designed for CLI standalone dyld_shared_cache extraction. It is the best tool for the job, and reverses the majority of "optimizations" that make DSC reverse engineering ugly and painful. Utilizing this plugin, Binja's processing should outperform IDAs, and wont require IDA's need for repeatedly right clicking and manually loading tons of modules.

This version of DyldExtractor has a lot of modifications (read: a lot of commented out lines) from the original designed to make it function better in the binja environment.

ktool is a multifaceted project I wrote for, primarily, MachO + ObjC Parsing.

It is mainly used for super basic parsing of the output, as we need to properly write the segments to the VM (and scrap all the dsc data that was originally in this file) so the Mach-O View knows how to parse it.

License

This plugin, along with ktool and dyldextractor are released under an MIT license. Both of these plugins are vendored within this project to make installation slightly simpler.

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Comments

TypeError: cannot unpack non-iterable NoneType object

Tried this just now, and got this, trying to extract the macOS 13.1 x86_64h cache:

Successfully installed: Dyld Shared Cache Processor
Loaded python3 plugin 'cxnder_bndyldsharedcache'
Traceback (most recent call last):
  File "/Applications/Binary Ninja.app/Contents/MacOS/plugins/../../Resources/python/binaryninja/binaryview.py", line 2818, in _init
    return self.init()
  File "/Users/torarne/Library/Application Support/Binary Ninja/repositories/community/plugins/cxnder_bndyldsharedcache/dsc.py", line 101, in init
    stub_fixer.fixStubs(extraction_ctx)
  File "/Users/torarne/Library/Application Support/Binary Ninja/repositories/community/plugins/cxnder_bndyldsharedcache/DyldExtractor/converter/stub_fixer.py", line 1681, in fixStubs
    _StubFixer(extractionCtx).run()
  File "/Users/torarne/Library/Application Support/Binary Ninja/repositories/community/plugins/cxnder_bndyldsharedcache/DyldExtractor/converter/stub_fixer.py", line 1011, in run
    self._symbolizer = _Symbolizer(self._extractionCtx)
  File "/Users/torarne/Library/Application Support/Binary Ninja/repositories/community/plugins/cxnder_bndyldsharedcache/DyldExtractor/converter/stub_fixer.py", line 59, in __init__
    self._enumerateExports()
  File "/Users/torarne/Library/Application Support/Binary Ninja/repositories/community/plugins/cxnder_bndyldsharedcache/DyldExtractor/converter/stub_fixer.py", line 101, in _enumerateExports
    if depInfo := self._getDepInfo(dylib, self._machoCtx):
  File "/Users/torarne/Library/Application Support/Binary Ninja/repositories/community/plugins/cxnder_bndyldsharedcache/DyldExtractor/converter/stub_fixer.py", line 179, in _getDepInfo
    imageOff, dyldCtx = self._dyldCtx.convertAddr(imageAddr)
TypeError: cannot unpack non-iterable NoneType object
BinaryView of type 'DyldSharedCache' failed to initialize!
No available/valid debug info parsers for `Raw` view
Found more than 'analysis.limits.stringSearch' (0x100000) strings aborting search for range: 0 - 0x33be0000
Analysis update took 12.239 seconds

opened by torarnv 1

prep for plugin manager

Looks like only two changes are required to get this added to the BN plugin manager. The first is to add a requirements.txt -- while ktool and DyldExtractor are versioned, capstone is still a requirement of DyldExtractor so it would be nice to expose that.

Or, better yet, replace the disassembler with BN's own disassembly to remove the dependency entirely. That also means there's no need to hack around the lack of PAC instructions as BN can disassemble those just fine.

The other step is to make a release, then we can add the plugin directly to the plugin manager which would be really handy!

opened by psifertex 1
fix relative imports for built-in BN Py 3.8.9 on MacOS

I'm not sure whether it's the exact python version or the fact that I'm using the BN shipped Python versus homebrew / ports but I'm unable to use the plugin as-is on MacOS without this change. I don't know how much this versioned DyldExtractor has differed, happy to test/submit upstream in the parent repo if you prefer.

opened by psifertex 0

Releases(1.0.0)

1.0.0(Mar 1, 2022)

Initial Release
Source code(tar.gz)
Source code(zip)

Owner

cynder

macOS/iOS development @ reverse engineering chick. // maintainer of the iPhone Dev Wiki (https://iphonedev.wiki)

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